一种用于深空测距的数字化锁相环设计  

Design of a Digital PLL for Deep Space Ranging

作　　者：李湘鲁[1] 周劼[1] 张健[1] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《飞行器测控学报》2008年第5期30-33,共4页Journal of Spacecraft TT&C Technology

摘　　要：在深空测距中，扩大锁相环捕获范围与提高锁相环对微弱信号检测能力是一对矛盾。为解决这一矛盾，本文提出一种基于频率引导与二次混频的数字化锁相环结构，并对其性能进行理论分析和计算机仿真。仿真结果表明，该锁相环可以很好地在较大范围内实现对微弱测距信号的捕获锁定。该结构已在实际测距接收机中使用。Extending capture range of phase-locked loop is inconsistent with enhancing signal detection ability in deep space ranging. To solve this problem, this paper presents a digital PLL structure based on the approach of frequency guidance and secondary mixing. Relevant theoretic analysis and computer simulation are implemented. Simulation results show that the PLL can capture weak range signal at long distance. Such a structure has already been used in a ranging receiver.

关 键 词：测距 二次混频 数字化锁相环 

分 类 号：TN911.8[电子电信—通信与信息系统]